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-- PeterKammel - 28 Mar 2009


We had a Geant3 simulation for MuCap for some time. The code was in FORTRAN mainly developed by Peter K and Bernhard. Documentation:

In March 2009 Peter started the development of a GEANT4 version of this program motivated by the following issues

  • We need intense MC effort to study important issues in the ongoing final MuCap analysis, e.g. like the electron/muon interference.
  • We need a Monte Carlo for MuSun to optimize the pad geometry and to simulate and study fusion processes and tracking.

A skeleton version has been released to CVS and Serdar will continue to develop this tool. The detector modeling and mapping to the input stream might proceed with the help of Fred, Volodya and Bernhard.



Define your G4WORKDIR. Run on pion1 to have correct libraries. CVS the G4MuCap there. cd G4MuCap. source setup after adjusting it. cd $G4WORKDIR. cp -R examples from $G4INSTALL (probably not necessary but educational. Different vis drivers installed. OpenGl, DAWNFILE, HepRep, jas3+WIRED4 according to Geant Manual


MuCap is derived from example ExN02. cd $G4MuCap.

  • gmake clean
  • gmake
  • MuCap
  • jas3 scene-0.heprep.zip

There is a

const static G4int nSegScale=10; // scales the segmentation for easier display

in MuCapDetectorConstruction.hh to scale the real segmentation for graphic viewing. The relevant detector geometry parameters are private data member of the class and are defined in one block of code within MuCapDetectorConstruction.cc. All relevant parameters should be defined there.

Todo List

  • Refine geometry (lower priority)
  • Refine gun (lower priority)
  • Include missing sensitive detectors
  • Install some messengers for interactive change of beam parameters and switch on/of geometry elements
  • Perform EndOfEvent(G4HCofThisEvent*) processing in sensitive detector to define tree of hits and MC generated information
  • Identify mapping between geometry and readout
  • Tune and explore performance with/without graphics
  • Include hard trajecory filtering


There are several studies we want to perform. They include

Pre analysis

  • Stopping distribution on individual anodes with cuts
  • Electron-muon track interference
  • m+p scattering (G4SingleScattering?)
  • Diffusion?

Full Analysis

  • Blue cont anode studies

Peter and Serdar will look into this.




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